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Thanks, Phil. I ran some more tests, this time varying filter grade and keeping the development time at two minutes. It's interesting, the 2.5 really is printing like a 4, but the ES gets closer to the 'advertised' value as the grade drops, i.e., the #2.5 prints like a #4, but the #0 prints like a #0. (Haven't tried grades higher than 2.5 yet.) ES appears to change pretty linearly with filter grade. The measured ES at higher filter grades is consistent with how my negatives have been printing.
I'm going to run some more tests today - would like to try Ilford's recommended developer for comparison with Dektol.
Chris
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